Magnetic Induction and Demagnetization

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Magnetic Induction

Magnetic induction is the process by which substances like iron are magnetised by the magnetic field. The magnet causes the individual particles of the iron, which act like tiny magnets, to line up so that the sample as a whole becomes magnetised. Most of this induced magnetism is lost when the cause of magnetism is taken away.

Activity 1

Place an iron nail on the table.

Place small pin near the iron nail.

Now, put a bar magnet above the iron nail and see what happens.

You can see the iron nail gets magnetise and attract the pin towards it.

Demagnetization

Demagnetization means decreasing magnetic property or losing it completely. In the following conditions, magnet loses its property.

Dropping regularly from the table or height.

Rubbing against diamagnetic substances.

Bringing similar poles closer by applying an external force.

Using the magnet for making other magnets.

By heating the magnet.

By passing the magnet in a copper coil of alternating current (AC) and pulling it against the direction of the current.

Ways to prevent magnet from demagnetization:

Do not heat magnet or keep it near the hot object.

Do not drop the magnet.

Do not hit or rub magnet.

Do not let magnet rust.

Do not keep similar poles of magnet closer to each other.

Magnetic induction is the process by which substances like iron are magnetised by the magnetic field.

Magnetic induction is the process by which substances like iron are magnetized by magnetic field. The magnet causes the individual particles of the iron, which act like tiny magnets, to line up so that the sample as a whole becomes magnetized. Most of this induced magnetism is lost when the cause of magnetism it is taken away.

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______ is the process by which substances like iron are magnetized by magnetic field.